#top{
    width: 780px;
    height: 183px;
    background-color: white;
    float: left;
    margin-bottom: 1px;
}
#top1{
    width: 780px;
    height: 150px;
    background:url(../img/banner.jpg);
}
#top2{
    width: 780px;
    height: 33px;
}
#top2 li{
    width: 78px;
    height: 33px;
    float: left;
    text-align: center;
    line-height: 33px;
    list-style: none;
    background: url(../img/button1.jpg);
}
#top2 a{
    color: cornflowerblue;
}
#top2 li:hover{
    background: url(../img/button1_bg.jpg);
    position: relative;
    right: 1px;
    bottom: 1px;
}